系统默认PTY 511太少

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我是开发者，日常工作会同时打开大量终端（tmux、多项目、自动化脚本、node‑pty 等）。在这种现代开发场景下，511 的 PTY 上限明显过低，而且这个默认值对顶配机器（128GB RAM）和低配机器是一样的，没有随硬件规格调整，这不合理。

我尝试过使用 tmux control mode 来减少 PTY 占用，但它会导致终端输出对齐错乱，影响可用性，所以必须继续使用 PTY 模式。这意味着只要终端数量稍多，就很容易触及 511 上限，导致系统层面无法创建新终端，影响全局稳定性。

总结：

谢谢！

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Answered by DTS Engineer in 884203022

Sadly, I can’t read Chinese, so I’m answering based on a machine translation.

My understanding is that:

The 511 limit is a default.
The hard limit is 999.
You can control this via sysctl with the kern.tty.ptmx_max selector, for example:

% sudo sysctl kern.tty.ptmx_max=800 
kern.tty.ptmx_max: 511 -> 800

Please try that out and let me know how you get along.

Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"

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DTS Engineer OP

Apple

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Sadly, I can’t read Chinese, so I’m answering based on a machine translation.

My understanding is that:

The 511 limit is a default.
The hard limit is 999.
You can control this via sysctl with the kern.tty.ptmx_max selector, for example:

% sudo sysctl kern.tty.ptmx_max=800 
kern.tty.ptmx_max: 511 -> 800

Please try that out and let me know how you get along.

Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"

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